D4, Octamethylcyclotetrasiloxane 1. CAS No.: 556-67-2 2. Purity: >99% 3. ... ,6,6,8,8-Octamethyl-1,3,5,7,2,4,6,8-tetraoxatetrasiloxane1. Properties:Chemical Name: Octamethylcyclotetrasiloxane(D4) CAS No.:556 ... and Appearance:Colorless clear oily liquid2. Applications:D4, Octamethylcyclotetrasiloxane, CAS No.: 556-67-2 is a base fluid in a ... .Stored in shady, cool and ventilated place. D4 CAS No.: 556-67-2